http://digiphoto.techbang.com/posts/4630-pentax-mx-1-evaluation-renewal-of-classic-retro-wen-qing-is-worth-losing-it?page=2
(in Chinese, Google machine-translated page here.)
A full ISO comparison with full test samples are posted. The reviewer says that the IQ is not good enough starting from ISO800 with the significant loss of details and the appearance of more noise, which is considered
